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Working designs for parachute ammo (with a difference...)

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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Unread postAuthor: Technician1002 » Sun Sep 19, 2010 11:35 pm

The guy on Crazybuilders was successful, but he used a helmet cam with memory instead of a transmitter and no chute. Video is here;
http://www.crazybuilders.com/item.php?id=000004&type=project_section

I have been playing with launching a camera also. After several launches of rolls of adding machine tape, I'm wondering if a simple paper roll projectile would work to deploy a chute. On launch the paper unrolls at a known rate. When the paper is shed, the chute is deployed. I have not done it yet, but am considering it. I don't have a helmet cam to use for this. Budget constraints tend to get in the way of grand builds.
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Last edited by Technician1002 on Sun Sep 19, 2010 11:44 pm, edited 1 time in total.
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Unread postAuthor: jackssmirkingrevenge » Sun Sep 19, 2010 11:42 pm

Technician1002 wrote:The guy on Crazybuilders


Thanks for that, I knew I had seen this somewhere but couldn't find the link again :roll:
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Unread postAuthor: Technician1002 » Tue Sep 21, 2010 7:55 pm

I have graphs of in barrel projectile position vs time. .1 seconds is way too long. I'll find one and post an actual trace later. 0.02 is much closer to reality.

EDIT
T shirt cannon performance data provided below. Entire full 10 division trace is 0.025 seconds.
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Attachments
60 PSI T Shirt 2.5in.jpg
60 PSI t shirt launch. Each horizontal division is 0.0025 seconds. Each blip represents 1 foot of barrel travel.
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Unread postAuthor: jackssmirkingrevenge » Sat Jan 22, 2011 3:00 am

[youtube]http://www.youtube.com/watch?v=V3GhWbrGikI&feature=player_embedded[/youtube]

Done without a parachute, strapped to an arrow - surely one could easily do the same for a spudgun projectile?

You can get a fob camera for less than $15 posted, and a small MicroSD card for less than $5, so even if the camera was damaged or lost it wouldn't exactly be a financial disaster.
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